What's currently the best RGB mod for the PC Engine?

Discussion in 'Modding and Hacking - Consoles and Electronics' started by FireAza, Apr 17, 2013.

  1. Segata Sanshiro

    Segata Sanshiro speedlolita

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    Is there any reason to use a thicker gauge of wire on the RGB lines than lunar?
     
  2. Ergot_Cholera

    Ergot_Cholera Keep your shirt on.

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    After reading up a bit more on the jailbars issue I am going to try the fix I have read about. 22uf ceramic caps from c6260 pins 41 and 43 to ground. Has anyone tried this with a good result?
     
  3. M54B25

    M54B25 Spirited Member

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    May I use 3.9M or 3.3M ohm resistor instead of 3.6M (pull up resistor)? I can't find that value in local shops, they have only 3.3 or 3.9.
    Another issue - 220uF instead of 330uF? I have 330uF but they are little to big for this PCB, 220uF are perfectly fit.
     
  4. voultar

    voultar Rapidly Rising Member

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    I used 3.3Mohm resistors for the color pull-ups, and I terminated the color outputs with 220uF capacitors with 75ohm resistors in-series.


    BIAS & DECOUP.jpg

    6px0rn.jpg

    This is an excellent circuit!
     
    Last edited: Nov 15, 2014
  5. M54B25

    M54B25 Spirited Member

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    Thanks!
    Here is my PCB:
    2014-11-17 13.08.03.jpg
     
  6. Segata Sanshiro

    Segata Sanshiro speedlolita

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    I got the kit with the 8 pin DIN and SCART lead. Amazing value.

    [​IMG]
    [​IMG]
    [​IMG]
     
  7. voultar

    voultar Rapidly Rising Member

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    It's a great circuit. I'm such a cheap bastard I hand assembled mine.
     
  8. M54B25

    M54B25 Spirited Member

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    PC Engine RGB mod done, now need RGB scart cable.
    What is the best way to make that cable with 8 pin mini din connector?
     
  9. Ergot_Cholera

    Ergot_Cholera Keep your shirt on.

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    It isn't a mini din, it's just a normal size 8 pin din connector.
     
  10. mickcris

    mickcris Site Supporter 2014,2015

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    I think most people use a mini din 9 because the 8 is the same connector as the controller. If you use a 9 pin mini din, you can also use a genesis/megadrive 2 scart cable after removing the caps/resistors in the scart plug (if there are any) and if you pinned the mini din to match the genesis pinout.

    If you still want to use the 8 pin mini din, and are in the USA, Monoprice has cheap mini din 8 cables. Just cut off one end and attach a scart plug:
    male/male for $1.50
    http://www.monoprice.com/Product?c_id=102&cp_id=10215&cs_id=1021501&p_id=522&seq=1&format=2
    male/female for $1.90 (cheap controller extension cables)
    http://www.monoprice.com/Product?c_id=102&cp_id=10215&cs_id=1021501&p_id=534&seq=1&format=2
     
    Last edited: Nov 25, 2014
  11. M54B25

    M54B25 Spirited Member

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    I bought 20 pieces of 8 pin mini din for 2$ and 3 connectors for 5$. I couldn't find 9 pin in my local shops, so I need to use 8 pin.
    I have Megadrive scart cable, but want to make another to separate cables between systems and boxes.
    I need only good schematic to make cable.
     
  12. mickcris

    mickcris Site Supporter 2014,2015

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  13. Ergot_Cholera

    Ergot_Cholera Keep your shirt on.

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    Sorry, my mistake. I was looking at the pictures of the Duo's above. It is a mini din for an original PC Engine. You can wire it any way you like.
    Here is a method
    http://www.mmmonkey.co.uk/pc-engine-rgb-mod/
     
  14. phipscube

    phipscube Member

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    I started off with mmmonkeys mod but found it was pretty poor quality, especially with banding on the screen. I ended up mixing a few ideas and made a custom board based off the IC mod and also incorporated sync and audio. the board fits over where the old RF unit was. I put two long screws through the solder posts that held the RF unit shielding, then mounted my board upside down. I used a mini DIN compatible with the Megadrive 2 SCART lead and matched its pinout on my board. And with my PC Engine being the original white model it now has a rock solid RGB output with no banding in the slightest (something that can still appear faintly on Core and Duo models). Here are some pics of my mod: -

    [​IMG]

    This is the board



    [​IMG]

    Mounting it in my PC Engine. I made a small connector to the underside wires so its easy to remove if need be.


    [​IMG]


    All in and held by the two screws.


    [​IMG]

    Its a tight squeeze but it all fits. I added a small piece of insulation tape over the Osc later on to avoid shorts.


    [​IMG]

    The small switch is connected to my internal Region switch chip (the Obey chip from PCEFX) so I can select JP or US

    More details on my G+ album https://plus.google.com/photos/106929866019169011552/albums/5774218923186781089
     
  15. FireAza

    FireAza Shake! Shake!

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    Very nice! The connector doesn't move around when you plug in the cable does it?
     
  16. phipscube

    phipscube Member

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    No its very solid. The board is held by 2 screws I put into the old solder holes that the RF unit used. I had an earlier more simple mod that had the connector hot glued, but it broke off, so this was like a version 2 :)
     
  17. Segata Sanshiro

    Segata Sanshiro speedlolita

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    Made the amp according to original spec, though I changed the 75Ohm resistors for 100Ohms as per the broken amplifier in my Duo R and N64.

    [​IMG]
    [​IMG]

    This was installed in my SNES Mini and RGB was tapped directly from the chip.

    [​IMG]

    I also took a dremel to the tabs in the cart slot and converted the power jack to a more standard one.

    http://i.imgur.com/v1dTOvi.jpg | http://i.imgur.com/eKo8H8s.jpg

    As usual, it is looking great with an official GC SCART lead into my Trinitron.

    [​IMG]

    Love this amp. :)
     
  18. M54B25

    M54B25 Spirited Member

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    I just recived PCE controller and F1 game, so I checked my modded console ;)
    My 32" LCD shows beautiful image but moved to the left side. Why? Try to check on CRT TV?
    Also I have bad audio and hear some buzzy noise.
    I made SCART cable using Sega Saturn diagram from mmmonkey.
    Bad shielding or what?
    Here is video:
    https://www.youtube.com/watch?v=FqbnTc1XBC4&feature=youtu.be
    EDIT:
    How it looks now on 52" LCD:
    [​IMG]
    Problem with sound is solved. I forgot connect shield in SCART plug.
     
    Last edited: Mar 11, 2015
  19. Goemon

    Goemon Enthusiastic Member

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  20. M54B25

    M54B25 Spirited Member

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    I think You can use it, but that caps are bigger then smd. There are only differences in shape and size.
     

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